Last mile deliveries with lockers: formulations and algorithms

In this paper, we consider the use of lockers in parcel delivery, a recent method used last mile logistics. Lockers are pickup points made several cells that located city where customers can collect their parcels as an alternative to home delivery. We study routing problems which one or multiple vehicles deliver directly lockers. also influence introduction when these include time windows. propose set novel formulations for problems, some valid inequalities, and branch-and-cut algorithm. Moreover, investigate difference between with classical problems.